题目内容

若一棵度为7的树有8个度为1的结点，有7个度为2的结点，有6个度为3的结点，有5个度为4的结点，有4个度为5的结点，有3个度为6的结点，有2个度为7的结点，则该树一共有(48)叶结点。

A. 35
B. 36
C. 77
D. 78

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听力原文： I want to remind everyone that this Friday is clean-up day—what that means is we're going to put a couple of large garbage bins in the cafeteria so you can throw away old papers, out-of-date materials, and all the other junk that's piling up on or around your desks. It's actually a fire hazard to have stacks of papers on your desks or piled on overhead shelves or cabinets. So, please, everyone, mark this Friday, from noon to 5, on your calendar as a time to dump some of your clutter. And it'll be fun—there will be pizza and soda for everyone who contributes to the bins.
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【C5】

A. as
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A. 正确
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